Adapter for filter cartridge

Abstract

An adapter for a water supply system includes castlellations around the periphery of the mounting hub. The castellations eliminate the continuous sealing surface required for a standard filter end cap to effective seal to the adapter. The mounting hub has ribs on the internal periphery to prevent insertion of filter cartridge end caps with a flat O ring seal or with an O ring seal around the periphery thereof.

1. A filter system comprising:
 an adapter having a mounting hub; 
 castellations around the periphery of said mounting hub; and 
 a filter cartridge having art end cap with a sealing surface which forms a seal with said adapter; 
 said castellations providing a discontinuous sealing surface with a flat filter end cap thereby preserving the integrity of the system by ensuring that the correct filter cartridge is installed. 
 
   
   
     2. The filter system recited in  claim 1  wherein said adapter has ribs on the internal periphery of said mounting hub. 
   
   
     3. The filter system recited in  claim 1  and an O ring on the external periphery of said adapter, said filter cartridge having an end cap which fits over said outer periphery of said adapter with a seal between said adapter and said end cap provided by said O ring. 
   
   
     4. The filter system recited in  claim 1  and a supply of fluid to be filtered, wherein said adapter has a connector for securing said adapter to said supply of fluid. 
   
   
     5. The system recited in  claim 1  wherein said castellations are a series of notches along the leading edge and around the periphery of said mounting hub. 
   
   
     6. The system recited in  claim 5  wherein said adapter is part of an assembly having a head and said castellations are located in the underside of said head.